ASoC: soc: add a new dailink for VI recording

SLIMBUS 4 TX is used for speaker protection. To enable VI
recording without breaking speaker protection, a new dailink
is added as non-hostless.

CRs-Fixed: 1087025
Change-Id: I440b7826fb5fd4fbd55831c1e89b9b010f3b948c
Signed-off-by: Xiaojun Sang <xsang@codeaurora.org>